Abstract
The average torque of concentrated winding PM machines can be increased significantly by supplying current waveforms matching in full the trapezoidal back EMF. However, such current supply arrangements involve a large harmonic current flowing into the machine neutral. This paper presents an innovative converter topology to overcome the problem. This new configuration extends the standard layout of conventional PWM-VSI by adding a fourth branch devoted to control the voltage of the machine neutral. The inverter modes of operation resulting from the modulation of the machine neutral are discussed, and the paper reports the experimental results achieved from a converter prototype which has been constructed using IGBTs. Results show that the new inverter configuration allows significant benefits in the machine average torque, as well as the fact that the machine neutral modulation introduces an additional degree of freedom in the machine torque control.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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